html,body{
    width: 100%;
    height: 100%;
}
header,footer{
    width: 100%;
    margin: 0 auto;
}
header{
    height: 166px;
    background: lightgreen;
}
.wrap{
    width: 66.7%;
    margin: 0 auto;
    background: lightyellow;
    min-width: 1200px;
}
.nav{
    width: 77.66%;
    height: 50px;
    display: flex;
    justify-content: space-between;
}
.nav div{
    height: 100%;
    line-height: 50px;
    font-size: 16px;
    text-align: center;
    color: #323333;
    padding: 0px 30px;
}